Reassembly – Overmolded Diaphragms
WARNING
To reduce the risk of serious injury, including amputation, do not put your fingers or hand be- tween the air cover and the diaphragm.
1.Lubricate and install the shaft
2.Assemble the air side plate (104) onto the dia- phragm (403). The wide, radiused side of the plate must face the diaphragm. Apply
3.Grease the length and ends of the diaphragm shaft (24). Insert the shaft/diaphragm assembly into one side of the pump. Align the fluid cover (101) and the center housing (1) so the arrow (A) faces the same direction as the air valve. Secure the cover with the screws (107 and 108), handtight.
4.Torque the longer screws (108) oppositely and evenly to
5.Assemble the other diaphragm assembly to the shaft as explained in step 2. This diaphragm will be lifted off the air cover at this point.
6.Supply the pump with low pressure air (less than 7 psi [0.05 MPa, 0.5 bar]). The diaphragm will very slowly pull onto the air cover. Find the pressure that keeps the diaphragm close enough to secure with the screws, but does not let it contact the pilot pin.
NOTE: Do not deform the diaphragm manually. The diaphragm needs uniform pressure to deform properly for maximum life.
7.Align the fluid cover (101) and the center housing
(1) so the arrow (A) faces the same direction as the air valve. Secure the cover with two of the longer screws (108), handtight.
NOTE: If the diaphragm contacts the pilot pin and is forced away from the air cover, try Step 5 again. If necessary, return to Step 3.
8.Torque the longer screws (108) oppositely and evenly to
9.Reassemble the ball check valves and manifolds as explained on page 18.
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